Abstract:

A rapid multi-residue method based on accelerated solvent extraction (ASE) combined with dispersive solid-phase extraction (DSPE) followed by gas chromatography with electron-capture detection (GC-ECD) was developed for the determination of 14 organochlorine pyrethroid pesticides in Eucommia ulmoides Oliv. leaves. The average fortified recoveries of the pesticides at three levels of 10, 20 and 50 ng ranged from 76.8% to 118.9%, with a RSD between 2.6% and 13.9%. The quantitative detection limit of this method was 10 ng/g. In the concentration range of 2－100 ng/ml, most of the pesticides displayed a good linearity with peak area, with a correlation coefficient (R) higher than 0.998. The combination of ASE and DSPE gives a highly effective pretreatment for the rapid GC-ECD detection of multi-residue of organochlorine pyrethroid pesticides in Eucommia ulmoides Oliv. leaves.

Key words: accelera ted solvent extraction (ASE), dispersive solid-phase extraction (DSPE), gas chromatography (GC), organochlorine pyrethroid pesticide